20386694491 has 16 divisors (see below), whose sum is σ = 22710058560. Its totient is φ = 18213534720.

The previous prime is 20386694443. The next prime is 20386694501. The reversal of 20386694491 is 19449668302.

It is a cyclic number.

It is not a de Polignac number, because 20386694491 - 2¹⁵ = 20386661723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20386694591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369471 + ... + 421048.

It is an arithmetic number, because the mean of its divisors is an integer number (1419378660).

Almost surely, 2^20386694491 is an apocalyptic number.

20386694491 is a deficient number, since it is larger than the sum of its proper divisors (2323364069).

20386694491 is a wasteful number, since it uses less digits than its factorization.

20386694491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790614.

The product of its (nonzero) digits is 2239488, while the sum is 52.

The spelling of 20386694491 in words is "twenty billion, three hundred eighty-six million, six hundred ninety-four thousand, four hundred ninety-one".